阅读说明：本技术 沉井挖掘用推进系统及沉井挖掘方法 (Propulsion system for open caisson excavation and open caisson excavation method ) 是由 叶蕾 田彦朝 肖威 齐志冲 赵飞 吕旦 周倩 宋德华 崔磊 牛梦杰 王晓龙 于 2021-08-04 设计创作，主要内容包括：本发明为一种沉井挖掘用推进系统及沉井挖掘方法,该沉井挖掘用推进系统包括刀盘、驱动装置、多个推进装置和多组撑紧装置,驱动装置设置于刀盘的顶部,各撑紧装置沿沉井的轴向间隔分布,且各撑紧装置分别固定支撑于驱动装置与位于沉井侧壁上的管节之间；各推进装置沿井口的周向设置于地面上且靠近井口的位置,推进装置上设置有能上下滑动的滑动箱,滑动箱上设置有能伸缩运动的伸缩销轴,当伸缩销轴处于伸出至滑动箱的外部时,伸缩销轴与位于井口位置的管节的顶部抵接。本发明解决了全断面开挖设备结构复杂、拆装不便、使用效果不佳的技术问题。(The invention relates to a propulsion system for open caisson excavation and an open caisson excavation method, wherein the propulsion system for open caisson excavation comprises a cutter head, a driving device, a plurality of propulsion devices and a plurality of groups of tightening devices, the driving device is arranged at the top of the cutter head, the tightening devices are distributed at intervals along the axial direction of the open caisson, and the tightening devices are respectively and fixedly supported between the driving device and pipe joints positioned on the side wall of the open caisson; each advancing device sets up in subaerial and the position that is close to the well head along the circumference of well head, is provided with gliding slip box from top to bottom on the advancing device, is provided with the flexible round pin axle that can concertina movement on the slip box, when flexible round pin axle is in the outside that stretches out to the slip box, the top butt of the tube coupling that flexible round pin axle and be located the well head position. The invention solves the technical problems of complex structure, inconvenient assembly and disassembly and poor use effect of full-section excavation equipment.)

1. The utility model provides a propulsion system for open caisson excavation, includes the blade disc that excavates the open caisson and does the blade disc provides power's drive arrangement, drive arrangement set up in the top of blade disc, a serial communication port, propulsion system for open caisson excavation still is including promoting a plurality of propulsion devices that the blade disc is descending with right the position of blade disc in the open caisson carries out fixed multiunit and props up tight device, wherein:

the tensioning devices are distributed at intervals along the axial direction of the open caisson and are respectively and fixedly supported between the driving device and the pipe joints on the side wall of the open caisson;

each advancing device sets up in subaerial and be close to along the circumference of well head the position of well head, the last gliding slip case that can go up and down that is provided with of advancing device, be provided with the flexible round pin axle that can concertina movement on the slip case, work as flexible round pin axle is in and stretches out to when the outside of slip case, flexible round pin axle with be located the well head position the top butt of tube coupling.

2. The propulsion system for sinking of the open caisson of claim 1, wherein the number of the tightening devices is two, one group of the tightening devices comprises a plurality of first tightening members, each first tightening member is arranged on the top of the driving device, the first tightening members are arranged at intervals along the circumferential direction of the driving device, one end of each first tightening member is connected with the outer wall of the driving device, and the other end of each first tightening member is fixedly supported on the inner wall of the pipe section;

the other group of tightening devices comprises a plurality of second tightening pieces, each second tightening piece is arranged at the bottom of the driving device and is arranged along the circumferential direction of the driving device at intervals, one end of each second tightening piece is connected with the outer wall of the driving device, and the other end of each second tightening piece is fixedly supported on the inner wall of the pipe section.

3. The propulsion system for open caisson excavation as claimed in claim 1, wherein the propulsion device comprises a support base, an upright column and a propulsion cylinder, the upright column is vertically arranged on the top of the support base, the sliding box is slidably arranged on the upright column, the main body of the propulsion cylinder is connected with the sliding box, and the piston rod of the propulsion cylinder extends downwards along the vertical direction and is connected with the upright column.

4. The propulsion system for caisson excavation as claimed in claim 3, wherein the sliding box is provided with a rail sliding hole penetrating through the sliding box in a vertical direction, the sliding box is slidably sleeved on the column through the rail sliding hole, the sliding box is provided with a first mounting hole and a second mounting hole which are communicated with each other, both the axial direction of the first mounting hole and the axial direction of the second mounting hole are perpendicular to the axial direction of the rail sliding hole, the telescopic pin shaft is slidably arranged in the second mounting hole, the first mounting hole is internally and fixedly provided with a telescopic cylinder, and a piston rod of the telescopic cylinder can extend into the second mounting hole and is connected with one end of the telescopic pin shaft.

5. The propulsion system for open caisson excavation according to claim 4, wherein an abrasion resistant layer is provided on an inner wall of the rail slide hole.

6. The propulsion system for caisson excavation as claimed in claim 4, wherein said second mounting hole has a rectangular cross section, and said telescopic pin has a rectangular elongated structure fitted into said second mounting hole.

7. The propulsion system for caisson excavation as claimed in claim 3, wherein a fixing lug is provided at a lower portion of the pillar, and a piston rod of the propulsion cylinder is pivotally connected to the fixing lug.

8. The propulsion system for caisson excavation as recited in claim 1, further comprising a plurality of fixed bases, each of said fixed bases being disposed on the ground in a circumferential direction of the wellhead at a position close to the wellhead, each of said propulsion devices being fixedly mounted on top of a corresponding one of said fixed bases.

9. The propulsion system for open caisson excavation according to claim 8, wherein a plurality of anchor rods are connected between the fixed base and the ground.

10. The propulsion system for open caisson excavation as claimed in claim 1, wherein a plurality of cutting tools are provided at the bottom of the cutterhead, a plurality of power units are provided on the driving device, and a transmission structure is provided inside the driving device, and an output shaft of each power unit is connected to the corresponding cutting tool through the transmission structure.

11. The open caisson excavating method is characterized by comprising the following steps:

step S1: excavating an initial foundation pit;

step S2: installing pipe joints on the inner wall of the starting foundation pit;

step S3: fixedly arranging a plurality of propelling devices on the ground along the circumferential direction of a wellhead at a position close to the wellhead;

step S4: lowering the cutter head and the driving device to the bottom of the initial foundation pit, and fixing and tightly supporting the tightening device and the pipe joint;

step S5: starting the cutter head, and simultaneously extending the telescopic pin shafts on the propelling devices to the outside of the sliding box and abutting against the top of the pipe joints;

step S6: the sliding box on the driving part propelling device descends, and the pipe section whole, the driving device and the cutter head are pushed to tunnel downwards through the corresponding telescopic pin shaft;

step S7: when the pipe joints tunneled downwards to the position close to the wellhead are spliced into a ring shape, the sliding box on the propulsion device which is actuated returns to the original position and stops actuating, the sliding box on the propulsion device which is not actuated at the other part descends, and the whole pipe joints, the driving device and the cutter head are pushed by the corresponding telescopic pin shafts to continue tunneling downwards;

step S8: the steps of steps S6 and S7 are repeated in order.

12. The caisson excavation method of claim 11, wherein in the step S2, the ground surface near the wellhead is hardened and reinforced.

13. The caisson excavation method of claim 11, wherein the step S3 includes,

step S301: a plurality of fixed bases are distributed on the ground close to the wellhead along the circumferential direction of the wellhead and are fixed through anchor rods;

step S302: the propulsion device is arranged on the fixed base and is fixed through bolts.

Technical Field

The invention relates to the technical field of open caisson construction, in particular to a propulsion system for open caisson excavation and an open caisson excavation method.

Background

Open caisson is applied more and more widely in underground engineering, and occupies more and more important position. In the construction process of the open caisson, a common sinking method is usually adopted, so that the mechanical degree is low, the tunneling speed is low, and the safety risk is high.

At the present stage, full-face excavation equipment appears, and in the open caisson method shaft engineering, a full face is selected for excavation for safer and more efficient construction. However, the existing full-section excavation equipment has the defects of complex structure and long disassembly and assembly period; in addition, the prior art does not have a device for providing sufficient propelling force for the full face excavation device, and the full face excavation device also needs torque resisting the rotation of the cutter head during the working process, so the using effect is not ideal.

Aiming at the problems of complex structure, inconvenient disassembly and assembly and poor use effect of the full-face excavation equipment in the related art, an effective solution is not provided at present.

Therefore, the inventor provides a propulsion system for open caisson excavation and an open caisson excavation method by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.

Disclosure of Invention

The invention aims to provide a propulsion system for open caisson excavation and an open caisson excavation method, which can realize full-face excavation and excavation of the open caisson, are convenient to disassemble, assemble and transition, are convenient to maintain, and effectively improve the reliability and the working efficiency of open caisson excavation equipment.

The purpose of the invention can be realized by adopting the following technical scheme:

the invention provides a propulsion system for open caisson excavation, which comprises a cutter head for excavating an open caisson and a driving device for providing power for the cutter head, wherein the driving device is arranged at the top of the cutter head, the propulsion system for open caisson excavation further comprises a plurality of propulsion devices for pushing the cutter head to move downwards and a plurality of groups of tightening devices for fixing the position of the cutter head in the open caisson, and the propulsion system comprises:

the tensioning devices are distributed at intervals along the axial direction of the open caisson and are respectively and fixedly supported between the driving device and the pipe joints on the side wall of the open caisson;

each advancing device sets up in subaerial and be close to along the circumference of well head the position of well head, the last gliding slip case that can go up and down that is provided with of advancing device, be provided with the flexible round pin axle that can concertina movement on the slip case, work as flexible round pin axle is in and stretches out to when the outside of slip case, flexible round pin axle with be located the well head position the top butt of tube coupling.

In a preferred embodiment of the present invention, the number of the tightening devices is two, one set of the tightening devices includes a plurality of first tightening members, each of the first tightening members is disposed on the top of the driving device, and the first tightening members are arranged at intervals along the circumferential direction of the driving device, one end of each of the first tightening members is connected to the outer wall of the driving device, and the other end of each of the first tightening members is supported and fixed on the inner wall of the pipe section;

the other group of tightening devices comprises a plurality of second tightening pieces, each second tightening piece is arranged at the bottom of the driving device and is arranged along the circumferential direction of the driving device at intervals, one end of each second tightening piece is connected with the outer wall of the driving device, and the other end of each second tightening piece is fixedly supported on the inner wall of the pipe section.

In a preferred embodiment of the present invention, the propulsion device includes a support base, a column, and a propulsion cylinder, the column is disposed on the top of the support base along a vertical direction, the sliding box is slidably disposed on the column, a main body of the propulsion cylinder is connected to the sliding box, and a piston rod of the propulsion cylinder extends downward along the vertical direction and is connected to the column.

In a preferred embodiment of the present invention, the sliding box is provided with a rail sliding hole penetrating through the sliding box in a vertical direction, the sliding box is slidably sleeved on the column through the rail sliding hole, the sliding box is provided with a first mounting hole and a second mounting hole which are communicated with each other, an axial direction of the first mounting hole and an axial direction of the second mounting hole are both perpendicular to an axial direction of the rail sliding hole, the telescopic pin shaft is slidably disposed in the second mounting hole, and a telescopic cylinder is fixedly disposed in the first mounting hole, and a piston rod of the telescopic cylinder can extend into the second mounting hole and is connected to one end of the telescopic pin shaft.

In a preferred embodiment of the present invention, a wear-resistant layer is disposed on an inner wall of the track sliding hole.

In a preferred embodiment of the present invention, the cross section of the second mounting hole is rectangular, and the retractable pin is a rectangular strip-shaped structure that is matched with the second mounting hole.

In a preferred embodiment of the present invention, a fixing lug is disposed at a lower portion of the upright, and a piston rod of the thrust cylinder is pivotally connected to the fixing lug.

In a preferred embodiment of the present invention, the propulsion system for open caisson mining further includes a plurality of fixed bases, each of the fixed bases is disposed on the ground in a position close to the wellhead along a circumferential direction of the wellhead, and each of the propulsion devices is fixedly mounted on a top of the corresponding fixed base.

In a preferred embodiment of the present invention, a plurality of anchor rods are connected between the fixing base and the ground.

In a preferred embodiment of the present invention, a plurality of cutting tools are disposed at the bottom of the cutter head, a plurality of power devices are disposed on the driving device, a transmission structure is disposed inside the driving device, and an output shaft of each power device is connected to a corresponding cutting tool through the transmission structure.

The invention provides an open caisson excavating method, which comprises the following steps:

step S1: excavating an initial foundation pit;

step S2: installing pipe joints on the inner wall of the starting foundation pit;

step S3: fixedly arranging a plurality of propelling devices on the ground along the circumferential direction of a wellhead at a position close to the wellhead;

step S4: lowering the cutter head and the driving device to the bottom of the initial foundation pit, and fixing and tightly supporting the tightening device and the pipe joint;

step S5: starting the cutter head, and simultaneously extending the telescopic pin shafts on the propelling devices to the outside of the sliding box and abutting against the top of the pipe joints;

step S6: the sliding box on the driving part propelling device descends, and the pipe section whole, the driving device and the cutter head are pushed to tunnel downwards through the corresponding telescopic pin shaft;

step S7: when the pipe joints tunneled downwards to the position close to the wellhead are spliced into a ring shape, the sliding box on the propulsion device which is actuated returns to the original position and stops actuating, the sliding box on the propulsion device which is not actuated at the other part descends, and the whole pipe joints, the driving device and the cutter head are pushed by the corresponding telescopic pin shafts to continue tunneling downwards;

step S8: the steps of steps S6 and S7 are repeated in order.

In a preferred embodiment of the present invention, in step S2, the surface near the wellhead is hardened.

In a preferred embodiment of the present invention, the step S3 includes,

step S301: a plurality of fixed bases are distributed on the ground close to the wellhead along the circumferential direction of the wellhead and are fixed through anchor rods;

step S302: the propulsion device is arranged on the fixed base and is fixed through bolts.

From the above, the propulsion system for open caisson excavation and the open caisson excavation method of the invention have the characteristics and advantages that:

the fixed support has the multiunit to prop tight device between drive arrangement and tube coupling, and each props tight device and along the axial interval distribution of open caisson, provides stable, firm tight power of propping for the blade disc in the open caisson through each props tight device, and then effectively resists the moment of torsion that the blade disc is rotatory to be produced, improves the stability that the blade disc was tunneled, can guarantee high efficiency, construction safely more, and dismouting, transition convenience, the maintenance of being convenient for is suitable for full section open caisson to excavate and uses.

Be provided with a plurality of advancing device on being close to the subaerial of well head, advancing device is last to be provided with gliding slip box from top to bottom, be provided with the flexible round pin axle that can concertina movement on the slip box, flexible round pin axle can with the top butt of tube coupling under the state of stretching out, thereby at the down in-process of slip box, flexible round pin axle can promote the tube coupling whole, drive arrangement and blade disc are tunnelling downwards in step, provide sufficient driving force for the blade disc is to full section excavation and constantly impel downwards, guarantee going on smoothly to the full section excavation of open caisson.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.

Wherein:

FIG. 1: the invention is a structural schematic diagram of the propulsion system for open caisson excavation.

FIG. 2: the invention is a schematic position diagram of each propulsion unit in the propulsion system for open caisson excavation.

FIG. 3: the invention is a schematic structural diagram of a propulsion device in the propulsion system for open caisson excavation.

FIG. 4: is the top view of the sliding box in the propulsion system for open caisson excavation of the invention.

FIG. 5: is a front sectional view of the sliding box in the propulsion system for open caisson excavation of the invention.

The reference numbers in the invention are:

1. a cutter head; 2. A drive device;

3. a tightening device; 301. A first bracing member;

302. a second bracing member; 4. A telescopic oil cylinder;

5. a power plant; 6. Pipe joints;

7. anchor bolts; 8. A fixed base;

9. a propulsion device; 901. A support base;

902. a column; 903. A propulsion cylinder;

904. fixing the ear seat; 10. A telescopic pin shaft;

11. a slide box; 1101. A rail slide hole;

1102. a wear layer; 1103. A second mounting hole;

1104. a first mounting hole.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

Implementation mode one

As shown in fig. 1 and 2, the invention provides a propulsion system for open caisson excavation, which comprises a cutterhead 1, a driving device 2, a plurality of propulsion devices 9 and a plurality of groups of tightening devices 3, wherein the cutterhead 1 is used for excavating the open caisson, the driving device 2 is used for providing power for the cutterhead 1, the plurality of groups of tightening devices 3 are used for fixing the position of the cutterhead 1 in the open caisson, and the plurality of propulsion devices 9 work alternately, so that the cutterhead 1 can move downwards in the open caisson by pushing a pipe joint 6. Wherein: the driving device 2 is arranged at the top of the cutter head 1, the supporting devices are distributed at intervals along the axial direction of the open caisson, and the supporting devices 3 are fixedly supported between the driving device 2 and pipe joints 6 on the side wall of the open caisson respectively; each advancing device 9 sets up in subaerial and the position that is close to the well head along the circumference of well head, is provided with gliding slip case 11 from top to bottom on the advancing device 9, is provided with the flexible round pin axle 10 that can concertina movement on the slip case 11, and when flexible round pin axle 10 was in the outside of stretching out to slip case 11, the top butt of flexible round pin axle 10 and the tube coupling 6 that is located the well head position.

According to the invention, a plurality of groups of tightening devices 3 are fixedly supported between the driving device 2 and the pipe joints 6, the tightening devices 3 are distributed at intervals along the axial direction of the open caisson, and the tightening devices 3 can provide stable and firm tightening force for the cutter head 1 in the open caisson, so that the torque generated by the rotation of the cutter head 1 is effectively resisted, the tunneling stability of the cutter head 1 is improved, the smooth cutting of the cutter head 1 on the stratum is ensured, more efficient and safe construction can be ensured, the assembly, disassembly and transition are convenient, the maintenance is convenient, and the device is suitable for the full-section open caisson to excavate and use. In addition, be provided with a plurality of advancing device 9 on the ground near the well head, be provided with gliding slip box 11 from top to bottom on the advancing device 9, be provided with the flexible round pin axle 10 that can concertina movement on the slip box 11, flexible round pin axle 10 can with the top butt of tube coupling 6 under the state of stretching out, thereby in the case 11 in-process that descends that slides, flexible round pin axle 10 can promote the tube coupling 6 wholly, drive arrangement 2 and blade disc 1 are tunnelling downwards in step, provide sufficient driving force for blade disc 1 is to full section excavation and constantly impel downwards, guarantee to going on smoothly of open caisson full section excavation.

In an alternative embodiment of the present invention, as shown in fig. 1, a plurality of cutting tools are disposed at the bottom of the cutter head 1, a plurality of power devices 5 are disposed on the driving device 2, and a transmission structure is disposed inside the driving device 2, and an output shaft of each power device 5 is connected to a corresponding cutting tool through the transmission structure. The power device 5 provides power for the rotation of the cutting tools on the cutter head 1.

Further, the power device 5 may employ, but is not limited to, a driving motor.

In an alternative embodiment of the present invention, as shown in fig. 1, the number of the tightening devices 3 is two, and the two sets of tightening devices 3 are respectively disposed at the top and the bottom of the driving device 2, so as to ensure that the driving device 2 can receive a stable supporting force as a whole, and further improve the stability of the fixed support for the driving device 2.

Specifically, as shown in fig. 1, the group of tightening devices 3 includes a plurality of first tightening pieces 301, each first tightening piece 301 is disposed at the top of the driving device 2, and the first tightening pieces 301 are circumferentially spaced and uniformly arranged along the driving device 2, one end of each first tightening piece 301 is connected to the outer wall of the driving device 2, and the other end of each first tightening piece 301 is supported and fixed to the inner wall of the pipe joint 6; the other group of tightening devices 3 comprises a plurality of second tightening pieces 302, each second tightening piece 302 is arranged at the bottom of the driving device 2, the second tightening pieces 302 are circumferentially spaced and uniformly distributed along the driving device 2, one end of each second tightening piece 302 is connected with the outer wall of the driving device 2, and the other end of each second tightening piece 302 is supported and fixed on the inner wall of the pipe joint 6.

Further, each of the first clamping members 301 and the outer wall of the driving device 2, and each of the second clamping members 302 and the outer wall of the driving device 2 may be fixed by bolts or welding.

In an alternative embodiment of the present invention, as shown in fig. 1 and fig. 2, the propulsion device 9 includes a support base 901, a column 902, and a propulsion cylinder 903, the column 902 is disposed on the top of the support base 901 along the vertical direction, the bottom of the column 902 is fixedly connected to the top of the support base 901, the sliding box 11 is slidably disposed on the column 902 along the column 902, the main body of the propulsion cylinder 903 is fixedly connected to the sliding box 11, a fixed ear seat 904 is fixedly disposed on the lower portion of the column 902, and a piston rod of the propulsion cylinder 903 extends downward along the vertical direction and is pivotally connected to the fixed ear seat 904. By controlling the action of the thrust cylinder 903, the sliding box 11 can be pushed to slide on the upright post 902, so that power is provided for the downward movement of the cutter head 1.

Specifically, as shown in fig. 3 to 5, a rail sliding hole 1101 penetrating through the sliding box 11 in the vertical direction is formed in the sliding box 11, the sliding box 11 is slidably sleeved on the column 902 through the rail sliding hole 1101, a first mounting hole 1104 and a second mounting hole 1103 which are communicated with each other are formed in the sliding box 11, both the axial direction of the first mounting hole 1104 and the axial direction of the second mounting hole 1103 are perpendicular to the axial direction of the rail sliding hole 1101, the telescopic pin shaft 10 is slidably disposed in the second mounting hole 1103, the telescopic cylinder 4 is fixedly disposed in the first mounting hole 1104, and a piston rod of the telescopic cylinder 4 can extend into the second mounting hole 1103 and is connected with one end of the telescopic pin shaft 10. Through the action of controlling telescopic cylinder 4, can promote telescopic pin 10 and slide in second mounting hole 1103, and then can release telescopic pin 10 to the outside of second mounting hole 1103 to make telescopic pin 10 can with the top butt of tube coupling 6.

Further, as shown in fig. 4, the cross section of the second mounting hole 1103 is rectangular, and the telescopic pin 10 is a rectangular strip-shaped structure matched with the second mounting hole 1103, so that the telescopic pin 10 is prevented from rotating in the second mounting hole 1103, and the stability of the telescopic pin 10 in the abutting state with the pipe joint 6 is improved.

Further, as shown in fig. 3, two columns 902 and two thrust cylinders 903 are arranged on the top of the supporting base 901, and the columns 902 are arranged side by side. Of course, the number of the upright posts 902 and the thrust cylinders 903 can be adjusted according to the power required by the cutter head 1 to move downwards, so that the cutter head 1, the driving device 2 and the pipe joint 6 can be pushed to move downwards smoothly.

In an alternative embodiment of the present invention, as shown in fig. 4, a wear-resistant layer 1102 is disposed on an inner wall of the track sliding hole 1101, so that the wear-resistant capability of the track sliding hole 1101 can be enhanced, the inner wall of the track sliding hole 1101 is prevented from being worn by the sliding box 11 sliding for a long time, and the service life of the device is prolonged.

Further, the wear-resistant layer 1102 may be made of, but not limited to, copper plate.

In an alternative embodiment of the present invention, as shown in fig. 1, the propulsion system for open caisson mining further includes a plurality of fixed bases 8, each fixed base 8 is a rectangular block structure, each fixed base 8 is disposed on the ground along the circumferential direction of the wellhead and near the wellhead, and each propulsion device 9 is fixedly mounted on the top of the corresponding fixed base 8, so as to improve the pressure-bearing capacity of the ground and ensure the stability of the arrangement of the propulsion device 9.

Further, as shown in fig. 1, a plurality of anchor rods 7 are connected between the fixing base 8 and the ground.

Furthermore, the ratio of the number of the fixed bases 8 to the number of the propelling devices 9 is 1:2, and two adjacent propelling devices 9 are arranged on the same fixed base 8.

Specifically, the number of the fixed bases 8 is four, the number of the propelling devices 9 is eight, the propelling devices 9 are divided into two groups for alternate use, each group comprises four propelling devices 9, only four propelling devices 9 provide downward propelling force in the using process, and the other four propelling devices 9 stop working; after a complete circle of pipe sections 6 is spliced, the other four propelling devices 9 are alternately used for providing downward propelling force, and the four propelling devices 9 which are operated before stop working.

The propulsion system for open caisson excavation has the characteristics and advantages that:

the propulsion system for open caisson excavation can provide stable and firm supporting force for the cutter head 1 in the open caisson through the supporting devices 3, so that torque generated by rotation of the cutter head 1 is effectively resisted, the stability of excavation of the cutter head 1 is improved, smooth cutting of the cutter head 1 on a stratum is guaranteed, construction can be guaranteed to be more efficient and safe, and the propulsion system is convenient to disassemble, assemble and transition, convenient to maintain and suitable for full-section open caisson excavation.

Secondly, among this propulsion system for open caisson excavation, be provided with a plurality of advancing device 9, accessible advancing device 9 goes up gliding slip box 11 down and for the descending power that provides of blade disc 1, ensure that the pipe coupling 6 is whole, drive arrangement 2 and blade disc 1 can tunnel downwards in step, for blade disc 1 to the full section excavation and constantly advance downwards and provide sufficient driving force to guarantee going on smoothly to the full section excavation of open caisson.

Thirdly, the propulsion system for open caisson excavation can effectively improve the reliability of equipment and the excavation efficiency.

Second embodiment

The invention provides an open caisson excavating method, which comprises the following steps:

step S1: digging an initial foundation pit with a proper depth (which can be set according to actual conditions);

step S2: installing a pipe joint 6 on the inner wall of the starting foundation pit, and hardening and reinforcing the ground close to the wellhead;

step S3: fixedly arranging a plurality of eight propelling devices 9 on the ground along the circumferential direction of a wellhead and at a position close to the wellhead;

further, step S3 includes,

step S301: four fixed bases 8 are arranged on the ground close to the wellhead along the circumferential direction of the wellhead, and the fixed bases 8 are fixed on the ground through anchor rods 7;

step S302: two propelling devices 9 are arranged on each fixed base 8, and the propelling devices 9 are fixed through bolts.

Step S4: the cutter head 1 and the driving device 2 are lowered to the bottom of the initial foundation pit, and the bracing device 3 and the pipe joint 6 are fixedly braced;

step S5: starting the driving device 2 and the power device 5 to control the cutter head 1 to rotate, and simultaneously extending the telescopic pin shafts 10 on the propelling devices 9 out of the sliding box 11 under the thrust action of the telescopic oil cylinders 4 and being positioned right above the pipe joints 6 so that the telescopic pin shafts 10 can be abutted against the tops of the pipe joints 6 in the downward moving process;

step S6: the sliding boxes 11 on the four propelling devices 9 are driven to move downwards (namely, one propelling device 9 acts on each fixed base 8), and the whole pipe joint 6, the driving device 2 and the cutter head 1 are pushed to tunnel downwards by the corresponding telescopic pin shafts 10;

step S7: when a certain stroke is tunneled downwards (namely, the pipe joints 6 tunneled to the position close to the wellhead are spliced into a ring shape), the sliding boxes 11 on the four actuated propelling devices 9 are restored to the original positions and stop actuating, the sliding boxes 11 on the other part (namely, the other four) of the non-actuated propelling devices 9 move downwards, and the whole pipe joints 6, the driving device 2 and the cutter head 1 are pushed by the corresponding telescopic pin shafts 10 to continue tunneling downwards;

step S8: and (5) sequentially repeating the steps S6 and S7, and performing excavation, propelling and tunneling until the excavation work of the open caisson is finished.

The open caisson excavating method has the characteristics and advantages that:

compared with the prior art, the open caisson excavating method has the advantages that the propelling device 9 with simple structure and the plurality of groups of tightening devices 3 are designed, so that the full-face excavation and excavation of the open caisson can be realized; in addition, the propelling device 9 is arranged on the ground, so that the device is convenient to disassemble, assemble and transition, convenient to maintain, capable of improving the reliability of the device and the excavation efficiency, and suitable for popularization and use.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.